package com.imooc.lib_network.okhttp.cookie;

import android.content.Context;
import android.content.SharedPreferences;
import android.text.TextUtils;
import android.util.Log;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.CookieStore;
import java.net.HttpCookie;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * <pre>
 *     OkHttpClient client = new OkHttpClient.Builder()
 *             .cookieJar(new JavaNetCookieJar(new CookieManager(
 *                     new PersistentCookieStore(getApplicationContext()),
 *                             CookiePolicy.ACCEPT_ALL))
 *             .build();
 *
 * </pre>
 * <p/>
 * from
 * http://stackoverflow.com/questions/25461792/persistent-cookie-store-using-
 * okhttp-2-on-android
 * <p/>
 * <br/>
 * A persistent cookie store which implements the Apache HttpClient CookieStore
 * interface. Cookies are stored and will persist on the user's device between
 * application sessions since they are serialized and stored in
 * SharedPreferences. Instances of this class are designed to be used with
 * AsyncHttpClient#setCookieStore, but can also be used with a regular old
 * apache HttpClient/HttpContext if you prefer.
 */
public class PersistentCookieStore implements CookieStore {

	private static final String LOG_TAG = "PersistentCookieStore";
	private static final String COOKIE_PREFS = "CookiePrefsFile";
	private static final String COOKIE_NAME_PREFIX = "cookie_";

	private final HashMap<String, ConcurrentHashMap<String, HttpCookie>> cookies;
	private final SharedPreferences cookiePrefs;

	/**
	 * Construct a persistent cookie store.
	 *
	 * @param context
	 *            Context to attach cookie store to
	 */
	public PersistentCookieStore(Context context) {
		cookiePrefs = context.getSharedPreferences(COOKIE_PREFS, 0);
		cookies = new HashMap<String, ConcurrentHashMap<String, HttpCookie>>();

		// Load any previously stored cookies into the store
		Map<String, ?> prefsMap = cookiePrefs.getAll();
		for (Map.Entry<String, ?> entry : prefsMap.entrySet()) {
			if (((String) entry.getValue()) != null && !((String) entry.getValue()).startsWith(COOKIE_NAME_PREFIX)) {
				String[] cookieNames = TextUtils.split((String) entry.getValue(), ",");
				for (String name : cookieNames) {
					String encodedCookie = cookiePrefs.getString(COOKIE_NAME_PREFIX + name, null);
					if (encodedCookie != null) {
						HttpCookie decodedCookie = decodeCookie(encodedCookie);
						if (decodedCookie != null) {
							if (!cookies.containsKey(entry.getKey()))
								cookies.put(entry.getKey(), new ConcurrentHashMap<String, HttpCookie>());
							cookies.get(entry.getKey()).put(name, decodedCookie);
						}
					}
				}

			}
		}
	}

	@Override
	public void add(URI uri, HttpCookie cookie) {
		String name = getCookieToken(uri, cookie);

		// Save cookie into local store, or remove if expired
		if (!cookie.hasExpired()) {
			if (!cookies.containsKey(uri.getHost()))
				cookies.put(uri.getHost(), new ConcurrentHashMap<String, HttpCookie>());
			cookies.get(uri.getHost()).put(name, cookie);
		} else {
			if (cookies.containsKey(uri.toString()))
				cookies.get(uri.getHost()).remove(name);
		}

		// Save cookie into persistent store
		SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
		prefsWriter.putString(uri.getHost(), TextUtils.join(",", cookies.get(uri.getHost()).keySet()));
		prefsWriter.putString(COOKIE_NAME_PREFIX + name, encodeCookie(new SerializableHttpCookie(cookie)));
		prefsWriter.commit();
	}

	protected String getCookieToken(URI uri, HttpCookie cookie) {
		return cookie.getName() + cookie.getDomain();
	}

	@Override
	public List<HttpCookie> get(URI uri) {
		ArrayList<HttpCookie> ret = new ArrayList<HttpCookie>();
		if (cookies.containsKey(uri.getHost()))
			ret.addAll(cookies.get(uri.getHost()).values());
		return ret;
	}

	@Override
	public boolean removeAll() {
		SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
		prefsWriter.clear();
		prefsWriter.commit();
		cookies.clear();
		return true;
	}

	@Override
	public boolean remove(URI uri, HttpCookie cookie) {
		String name = getCookieToken(uri, cookie);

		if (cookies.containsKey(uri.getHost()) && cookies.get(uri.getHost()).containsKey(name)) {
			cookies.get(uri.getHost()).remove(name);

			SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
			if (cookiePrefs.contains(COOKIE_NAME_PREFIX + name)) {
				prefsWriter.remove(COOKIE_NAME_PREFIX + name);
			}
			prefsWriter.putString(uri.getHost(), TextUtils.join(",", cookies.get(uri.getHost()).keySet()));
			prefsWriter.commit();

			return true;
		} else {
			return false;
		}
	}

	@Override
	public List<HttpCookie> getCookies() {
		ArrayList<HttpCookie> ret = new ArrayList<HttpCookie>();
		for (String key : cookies.keySet())
			ret.addAll(cookies.get(key).values());

		return ret;
	}

	@Override
	public List<URI> getURIs() {
		ArrayList<URI> ret = new ArrayList<URI>();
		for (String key : cookies.keySet())
			try {
				ret.add(new URI(key));
			} catch (URISyntaxException e) {
				e.printStackTrace();
			}

		return ret;
	}

	/**
	 * Serializes Cookie object into String
	 *
	 * @param cookie
	 *            cookie to be encoded, can be null
	 * @return cookie encoded as String
	 */
	protected String encodeCookie(SerializableHttpCookie cookie) {
		if (cookie == null)
			return null;
		ByteArrayOutputStream os = new ByteArrayOutputStream();
		try {
			ObjectOutputStream outputStream = new ObjectOutputStream(os);
			outputStream.writeObject(cookie);
		} catch (IOException e) {
			Log.d(LOG_TAG, "IOException in encodeCookie", e);
			return null;
		}

		return byteArrayToHexString(os.toByteArray());
	}

	/**
	 * Returns cookie decoded from cookie string
	 *
	 * @param cookieString
	 *            string of cookie as returned from http request
	 * @return decoded cookie or null if exception occured
	 */
	protected HttpCookie decodeCookie(String cookieString) {
		byte[] bytes = hexStringToByteArray(cookieString);
		ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes);
		HttpCookie cookie = null;
		try {
			ObjectInputStream objectInputStream = new ObjectInputStream(byteArrayInputStream);
			cookie = ((SerializableHttpCookie) objectInputStream.readObject()).getCookie();
		} catch (IOException e) {
			Log.d(LOG_TAG, "IOException in decodeCookie", e);
		} catch (ClassNotFoundException e) {
			Log.d(LOG_TAG, "ClassNotFoundException in decodeCookie", e);
		}

		return cookie;
	}

	/**
	 * Using some super basic byte array &lt;-&gt; hex conversions so we don't
	 * have to rely on any large Base64 libraries. Can be overridden if you
	 * like!
	 *
	 * @param bytes
	 *            byte array to be converted
	 * @return string containing hex values
	 */
	protected String byteArrayToHexString(byte[] bytes) {
		StringBuilder sb = new StringBuilder(bytes.length * 2);
		for (byte element : bytes) {
			int v = element & 0xff;
			if (v < 16) {
				sb.append('0');
			}
			sb.append(Integer.toHexString(v));
		}
		return sb.toString().toUpperCase(Locale.US);
	}

	/**
	 * Converts hex values from strings to byte arra
	 *
	 * @param hexString
	 *            string of hex-encoded values
	 * @return decoded byte array
	 */
	protected byte[] hexStringToByteArray(String hexString) {
		int len = hexString.length();
		byte[] data = new byte[len / 2];
		for (int i = 0; i < len; i += 2) {
			data[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4)
					+ Character.digit(hexString.charAt(i + 1), 16));
		}
		return data;
	}
}